A Purchased List is a Dead List

As a permission-based email service provider, MailChimp doesn’t allow our users to send to purchased, rented, scraped, or stolen lists of email addresses. Why? Well, much like Lloyd Dobbler, we don’t want to process anything sold or bought. It’s annoying to the humans on the other end of those purchased lists who haven’t asked to be part of your …

The Little QA Team That Could

As of today, MailChimp’s QA team consists of one team leader, one engineer, and four analysts. That may not seem big, but it’s huge compared to where we were last year. Back then, we had just one QA tester—me!—working out the kinks of each of our monthly releases. I’ve learned a lot over the past …

Best Made’s Handy Back-in-Stock Messaging

If you’re a retailer, you want to make it as easy as possible for your customers to get their hands on your products. So what happens when a popular item is out of stock on your e-commerce site? How do you make sure the people who want to buy it know when it’s available again? Best …

Insights from MailChimp’s Send Time Optimization System

Late last year, MailChimp rolled out our Send Time Optimization feature. Built on the Email Genome Project, which powers many of our other products, Send Time Optimization does just what you’d think: It suggests to users when they should send their campaigns. "So," you might be thinking, "when is the optimal time to send?" Well, it depends on who you …

Competing with the World Cup for Subscribers’ Attention

The 2014 World Cup is underway, and chances are you’ve watched a game or two or ten. (Maybe the insane Germany/Brazil match yesterday?) At the very least, you’ve heard someone shouting “Goooooooalllll!!!!” in an adjacent room. With an event this big, the world pays attention. And that means the world isn’t paying attention to other things. Like calories, data …